Boiler.



F.P. PALEN & W. BURLINGHAM.

I BOILER. APPLICATION FILED FEB.23, 1911.

. 1 01 0 30 Patented Nov. 28, 1911.

l I l I l l I l l l 1 l I COLUMBIA PLANOGRAPH c0. WASHINGTON. n. c.

ITED STATES PATENT OFFICE.

FREDERICK P. PALEN AND WILLIAM BURLINGHAM, 0F NEWPORT NEWS, VIRGINIA.

BOILER.

Specification of Letters Patent.

Application filed. February 23, 1911. Serial No. 610,377.

To all whom it may concern:

Be it known that we, FREDERICK P. PALEN and WILLIAM BURLINGHAM, citizens of the United States, residing at Newport News, in the county of WVarwick and State of Virginia, have invented certain new and useful Improvements in Boilers, of which the following is a specification. v

Our invention relates to improvement to boilers and has particular reference to an improved form of the well-known type of watertube boilers, consisting of upper and lower drums connected by nests of tubes, and the aim of the invention is to provide a boiler which will permit of the ready removal of defective tubes, and the easy application of new tubes without changing the general construction, and to provide a boiler of greater efliciency by the use of a particular arrangement of generating tubes and battle plates, and to further provide an arrangement of superheaters for boilers of this general type, that can be economically installed so as to use the gases of combustion to the best advantage for superheating purposes.

At present when it is desired to remove a defective tube or permit the application of a new or perfect one, it has been foundjnecessary to provide a construction ofboiler having either a series of openings, in the opposite side of the drum, through which the tubes maybe withdrawn, or resort to a diificult and expensive arrangement of tubes installed so they can be drawn in the length wise direction of the drum, or to provide a drum of abnormally large size. In

providing holes through which the tubes can be removed the drum is weakened and the, additional openings increase the liability of leaks. If the tubes are arranged to draw in the lengthwise direction of the drum it necessitates curving the tubes and drilling the tube holes on an angle which is difficult and adds greatly to the cost of construction. If the drum is made large enough to draw straight tubes into the drum its size is prohibitive in boilers of this general type. In curing these serious defects we propose to make the tubes bothcurved and straight so they will occupy a position across the diameter of the drum when they are withdrawn, and to make a central drum of a diameter that will permit of sufiicient space to allow the curved and straight tubes to be pushed or withdrawn entirely into said boiler drum,

from whence they can be easily removed through a single manhole and new tubes inserted. This construction insures the minimum size of drum for removing curved and straight tubes lying in a plane perpendicular to a plane passing through the center of the drum. This insures one of the ob jects of the invention and not in theleast increasing the cost of the boiler but retaining the entire strength and durability of the structure.

We have provided a boiler of increased economy and eificiency by arranging baflie plates that cause the gases of combustion to pass across the upper portion of the tube nests into a secondary combustion chamber, which provides for the mixing of the gases of combustion again after they have passed -from the primary combustion chamber to the secondary combustion'chamber, thereby insuring complete combustion before the gases finally pass through the tube nests. The baffling causes the gases to pass from the secondary combustion chamber between the tubes by a long and circuitous passage before they are discharged to the smoke stack. These arrangements insure an increased efiiciency for the boiler which is the second object of our invention.

In providing for the superheating of the steam afterit is generated in the tubesand drums of the boiler we have arranged coils Patented Nov. 28, 1911. I

of tubes in the secondary combustion chamberwhere the gases are of a sufiiciently high temperature to be used economically for the purpose of superheating the steam. It is also desirable to have the temperature of the gases somewhat reduced from that existing in the primary chamber, in order that the tubes in which the steam is superheated will not corrode and burn out too rapidly. These results are attained by providing the secondary combustion chamber and passing the steam from theboiler drum through'coils located in the secondary combustion chamber. This insures the third objectof our invention.

With these objects in view our invention broadly stated consists of a boiler combining water drums and a steam drum with nests of curved and straight tubes adapted to be drawn entirely within the steam drum;also of water drums and a steam drum, nests of pipes and a primary and secondary combustion chamber also of water and steam drums, nests of pipes, a primary and secondary combustion chamber and superheat sists in certain features of construction and combination of parts substantially as disclosed herein.

Figure 1 represents a vertical sectional view of the complete boiler. Fig. 2 represents a side elevation, partly broken away, and Fig. 3 represents a detail view.

In the drawings, in which similar characters of reference denote corresponding parts in the several views, the numeral 1 indicates the sidewalls of the fire pot or furnace, while located at the upper'edge of the side walls 1 and extending longitudinally are the water drums 2 having the' perforated tube sheets 3 provided with the perforations 4- in which are engaged the lower ends of straight tubes 5 and the curved tubes 6.

Supported centrally and above the plane of the water drums is the central combined steam and water drum 7, the lower face of which forms a perforated tube sheet 8 in which are formed the perforations 9 of slightly greater size than the perforations 4 to permit the tubes to slide readily through said perforations 9; the upper ends of the tubes being upset or swelled to tightly fit the said perforations 9.

The passages for the circulation of the gases of combustion between the generating tubes to the secondary combustion chamber and again through the generating tubes are confined by the bafiies 13, 14, and 15 and the casing 16. The superheater tubes 17 receive the steam through the pipe 18 and the valve 19 from the steam drum 7, after which the steam passes through the superheater tubes 17 and out through the pipe 20.

From the foregoing description taken in connection with the drawings, the construction of our boiler will be readily understood and it will be seen that wehave provided an improved boiler which facilitates the securing in position of a large number of tubes in a vertical row, thus providing for our arrangement of bafiling and thoroughly utilizing the heat of the products of combustion as they pass between the tubes, while at the same time the large drum increases the water and steam containing capacity of the boiler, rendering the dangers and accidents resulting from low water and small water capacity'less liable; and we have provided a secondary combustion chamber in which the gases of combustion can be thoroughly mixed before again passing between the boiler tubes where the heat is finally extracted.

By reference to the drawing it will be seen that the various tubes are disposed in planesat right angles toa vertical plane passing through the aXis of the central drum, while it willbe further observed that the length of the straight tubes 5 and the cord of the curved tubes 6 are such that they can be withdrawn into the central drum. When it is desired to remove any of the tubes, it is only necessary to enter the lower or water drum and loosen the tubes in the'sheet, when the tubes may be forced upward into the central drum, the tubes 5 passing straight into the drum 7, while the tubes 6, which remain in the same plane, will curve around the inner face of the drum 7 as shown in dotted lines in Fig. 1, where the numeral 11 denotes the straight and the numeral 10 the curved tubes. It will be understood that the tubes when released at their lower ends may be forced upward until entirely contained within the drum and then shifted, withdrawn or replaced.

It will be further seen that we hzWe provided a boiler, with a secondary combustion chamber, in which the gases of combustion are thoroughly mixed before passing again between the tubes, and in which nest-s of tubes for superheating the steam can be conveniently located. The bafliing is arranged so the gases from the primary combustion chamber pass across the upper end of the tube nests to the secondary combustion chamber, returning through portions of the tube nests on their passage from the secondary combustion chamber to the smoke pipe; thereby providing a long and circuitous passage for the gases between the tubes thus causing a more complete extraction of the heat from the gases of combustion.

The secondary combustion chamber particularly lends itself for the superheater'arrangement we have provided; where the superheater tubes are placed in the secondary combustion chamber where the temperature of the gases is lower than in theprimary combustion chamber; thus obtaining a better temperature of gases for the purpose of superheating. Heretofore it has been difficult to make a satisfactory superheater installation in a water tube boiler of this general type because the arrangement of tubes and bafiiing has been such that the temperature of the gases were either too high or too low for the best results for superheating purposes. The-particular arrangement of drums, tubes and battles in our boiler are such that the superheaters can be advantageously installed where the temperature of the gases is the best for this purpose.

We have further provided, a new and novel construction in boilers of this general type, for the side walls 1 of the furnace. The walls are formed by hollow steel chambers 12, through which the water contained in the boiler is allowed to circulate. The side walls or chambers are connected through the headers 21 and 22 and the pipes 23 and 24: to the boiler drums, thusprovidtionable and so expensive for upkeep when the walls are made of brick, heretofore employed in boilers of this general type. The

hollow side walls with water circulation also prevent the radiation of heat from the furnaces. The arrangement of boiler adopted, and the use of the short tubes, which can be withdrawn into the boiler drum, en-

able us to raise the lower water drums, and

widen the grate, thus resulting in the use of a larger grate in a given space, the sides of the grate being protected by the hollow side walls. 7

It will be apparent that the leading features of our invention are the employment of the pair of water drums and the central steam drum with nests of combined curved and straight tubes, the central drum being of a size to permit the withdrawal therein of either the straight or curved tubes, as circumstances require, and while straight tubes have been used no provision has ever been made for the use of nests of combined straight and curved tubes, which is of great importance and a decided improvement. Also the combination with the water drums, steam drum and nests of combined curved and straight tubes for the purpose described with the baffling plates and the super-heaters is a novel and new feature and has advantages over other constructions. Also the combination with the drums and the side walls of the furnace of the metal chambers or casings communicating with the drums and forming in fact a part of the side walls is a new feature and of great importance as it insures a direct heat to the metal chamber. In fact the general construction and arrangement of the parts of our furnace is designed to permit of easy repair or re placement of parts and to insure the highest possible heating efficiency with a view to the saving of fuel.

We claim v 1. In a boiler, the combination of the fur nace,-the water drums, the steam drum, the

nests of pipes connecting the water and steam drums, the baffiing plates adjacent the nests of pipes, the metal chambers in the walls of the furnace parallel to and below the lower drums, and the pipes leading from each end of the metal chambers to the water and steam drums.

2. In a boiler, the combination of the furnace, the water drums, the steam drum, the nests of pipes connecting the water and steam drums, the bafiling plates adjacent the nests of pipes, the super-heaters inclosed by said baffling plates, the metal chambers in the walls of the furnace parallel to and below the lower drums, and the pipes leading from each end of the metal chambers to the water and steam drums.

In testimony whereof we affix our signatures in presence of two witnesses.

FREDERICK I. PALEN. WILLIAM BURLINGHAM. Witnesses:

J. W. DAVIS, B. J. PUSSEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

